static const a = 1;
const/b = 2;
let/c = 3;

<button onClick() { c = 4 }/>
<custom-tag>
  ${a} ${b} ${c}
</custom-tag>
<div>
  <if=Math.random()>
    <if=Math.random()>
      ${a} ${b} ${c}
    </if>
  </if>
</div>